Wisconsin Democratic Party press secretary Graeme Zielinski blamed Gov. Scott Walker and Republican lawmakers — who returned to work Tuesday — for causing the outage.
"In a direct assault on the First Amendment, Scott Walker's administration is blocking access in the Wisconsin Capitol to opposition websites," Zielinski said.
State Department of Administration spokeswoman Carla Vigue responded, saying, "DOA's security software automatically blocked the site, as it does all new websites."
"No one here at DOA decided to block it or took action to do so," he said. "The website is handled like any other website."
The Capitol internet service, which restricts access to certain websites considered inappropriate for lawmakers, revealed a "blocked page" when users tried to access the site using the building's wireless system.